Illustration of the role of UV radiation in the biogeochemical cycling of DOC

Illustration of the role of UV radiation in the biogeochemical cycling of DOC (map/graphic/illustration)

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Illustration of the role of UV radiation in the biogeochemical cycling of DOC
Sources Title (cont.) Under the influence of solar UV light, dissolved humic matter (DHM, organic matter largely derived from terrestrial ecosystems) in streams, lakes and coastal marine waters can be transformed to CO2. This can occur through purely abiotic photooxidation of DHM or through photolysis (cleavage) of DHM into smaller molecules more easily utilizable as a substrate for aquatic bacteria than the original high molecular weight DHM. Increased availability of bacterial substrate then leads to enhanced CO2 production through bacterial respiration. However, direct negative effects of UV light on bacteria, causing reduced growth and respiration, also influences the process. The balance between these separate processes in nature is unknown. (AAR Figure 11.22)
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Graphical production: Philippe Rekacewicz and Emmanuelle Bournay (GRID-Arendal)
Appears in AMAP Assessment Report: Arctic Pollution Issues
Published 1998
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